:root {
            --zpa57-primary: #004a99;
            --zpa57-primary-light: #005bc0;
            --zpa57-accent: #f39200;
            --zpa57-accent-hover: #ff9d0a;
            --zpa57-text: #2d3436;
            --zpa57-text-muted: #636e72;
            --zpa57-bg-light: #f8f9fa;
            --zpa57-white: #ffffff;
            --zpa57-glass: rgba(255, 255, 255, 0.9);
            --zpa57-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            --zpa57-radius: 16px;
            --zpa57-container: 1320px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
            color: var(--zpa57-text);
            line-height: 1.7;
            background-color: var(--zpa57-white);
            overflow-x: hidden;
        }

        /* Layout Utilities */
        .zpa57-container {
            max-width: var(--zpa57-container);
            margin: 0 auto;
            padding: 0 24px;
        }

        .zpa57-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .zpa57-flex-item {
            min-width: 0;
        }

        .zpa57-grid {
            display: grid;
            gap: 32px;
        }

        .zpa57-section {
            padding: 96px 0;
            word-break: break-word;
            overflow-wrap: break-word;
        }

        /* Typography */
        h1, h2, h3, h4 {
            line-height: 1.3;
            margin-bottom: 16px;
            word-break: keep-all;
            white-space: normal;
        }

        .zpa57-fluid-h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4rem); font-weight: 800; }
        .zpa57-fluid-h2 { font-size: clamp(1.8rem, 3vw + 0.5rem, 2.8rem); font-weight: 700; }
        .zpa57-fluid-p { font-size: clamp(1rem, 1vw + 0.5rem, 1.25rem); }

        /* Navigation */
        .zpa57-nav-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: var(--zpa57-glass);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .zpa57-nav-container {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .zpa57-logo img {
            height: 40px;
            width: auto;
            display: block;
        }

        .zpa57-menu {
            display: flex;
            list-style: none;
            gap: 8px;
        }

        .zpa57-menu-link {
            text-decoration: none;
            color: var(--zpa57-text);
            padding: 8px 16px;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .zpa57-menu-link:hover {
            background: rgba(0, 74, 153, 0.05);
            color: var(--zpa57-primary);
        }

        .zpa57-menu-link.zpa57-active {
            background: var(--zpa57-primary);
            color: var(--zpa57-white);
        }

        /* Hero Download Section */
        .zpa57-hero {
            padding-top: 160px;
            padding-bottom: 80px;
            background: radial-gradient(circle at 90% 10%, rgba(243, 146, 0, 0.05) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(0, 74, 153, 0.05) 0%, transparent 40%);
        }

        .zpa57-hero-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            align-items: center;
            gap: 64px;
        }

        .zpa57-hero-content {
            max-width: 720px;
        }

        .zpa57-hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(243, 146, 0, 0.1);
            color: var(--zpa57-accent);
            border-radius: 50px;
            font-weight: 600;
            font-size: 14px;
            margin-bottom: 24px;
        }

        .zpa57-download-card {
            background: var(--zpa57-white);
            padding: 40px;
            border-radius: var(--zpa57-radius);
            box-shadow: var(--zpa57-shadow);
            border: 1px solid rgba(0,0,0,0.03);
            position: relative;
            transition: transform 0.3s ease;
        }

        .zpa57-download-card:hover {
            transform: translateY(-5px);
        }

        .zpa57-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 18px 36px;
            border-radius: 12px;
            font-weight: 700;
            text-decoration: none;
            transition: all 0.3s ease;
            cursor: pointer;
            width: 100%;
            font-size: 18px;
        }

        .zpa57-btn-primary {
            background: linear-gradient(135deg, var(--zpa57-primary), var(--zpa57-primary-light));
            color: var(--zpa57-white);
            box-shadow: 0 10px 20px rgba(0, 74, 153, 0.2);
        }

        .zpa57-btn-primary:hover {
            box-shadow: 0 15px 25px rgba(0, 74, 153, 0.3);
            transform: scale(1.02);
        }

        /* Protocol Matrix Styles */
        .zpa57-matrix-section {
            background-color: var(--zpa57-bg-light);
            border-radius: 48px;
            margin: 0 24px;
        }

        .zpa57-matrix-grid {
            grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
        }

        .zpa57-matrix-item {
            background: var(--zpa57-white);
            padding: 32px;
            border-radius: var(--zpa57-radius);
            transition: all 0.3s ease;
        }

        .zpa57-tag-container {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 16px;
        }

        .zpa57-tag {
            padding: 4px 12px;
            background: #eee;
            border-radius: 6px;
            font-size: 13px;
            color: var(--zpa57-text-muted);
        }

        /* Features Display */
        .zpa57-feature-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
            margin-bottom: 80px;
        }

        .zpa57-feature-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .zpa57-feature-image-box {
            flex: 1;
            min-width: 300px;
            height: 400px;
            background: linear-gradient(45deg, #e9ecef, #f8f9fa);
            border-radius: var(--zpa57-radius);
            display: flex;
            align-items: center;
            justify-content: center;
            border: 2px dashed #dee2e6;
            position: relative;
            overflow: hidden;
        }

        .zpa57-feature-image-box::after {
            content: "MobaXterm Interface Preview";
            color: #adb5bd;
            font-weight: 600;
        }

        .zpa57-feature-text {
            flex: 1;
            min-width: 300px;
        }

        /* Download Table */
        .zpa57-table-wrapper {
            overflow-x: auto;
            margin-top: 32px;
            border-radius: 12px;
            border: 1px solid #eee;
        }

        .zpa57-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            background: var(--zpa57-white);
        }

        .zpa57-table th, .zpa57-table td {
            padding: 20px;
            border-bottom: 1px solid #eee;
        }

        .zpa57-table th {
            background: #f8f9fa;
            font-weight: 700;
            color: var(--zpa57-primary);
        }

        /* Footer */
        .zpa57-footer {
            background: #1a1c20;
            color: #a0a0a0;
            padding: 80px 0 40px;
        }

        .zpa57-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .zpa57-footer-brand {
            color: var(--zpa57-white);
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .zpa57-footer-link {
            color: #a0a0a0;
            text-decoration: none;
            display: block;
            margin-bottom: 12px;
            transition: color 0.2s;
        }

        .zpa57-footer-link:hover {
            color: var(--zpa57-accent);
        }

        .zpa57-copyright {
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.05);
            text-align: center;
            font-size: 14px;
        }

        /* Mobile Adjustments */
        @media (max-width: 992px) {
            .zpa57-hero-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .zpa57-hero-content {
                margin: 0 auto;
            }
            .zpa57-menu {
                display: none; /* In a real scenario, implement a hamburger menu */
            }
        }

        @media (max-width: 768px) {
            .zpa57-section { padding: 64px 0; }
            .zpa57-feature-row, .zpa57-feature-row:nth-child(even) {
                flex-direction: column;
            }
            .zpa57-matrix-grid {
                grid-template-columns: 1fr;
            }
        }